Hydrolysis and condensation mechanisms of a silane coupling agent studied by ¹³C and ²⁹Si NMR

Abstract

synopsisThe mechanisms of hydrolysis and condensation of a silane coupling agent, y-methacryloxypropyltrimetoxysilane (y-MpTs) were investigated by the me of both 13C and ?3i nuclear magnetic resonance ( N m ) spectroscopies. The NMR peaks of the hydrolyzed monomer and condensed polymer were asaigned readily. The rate of hydrolysis and condensation of y-MPTS was dependent on water content. On the basis of the time-dependent behavior of these peaks, the mechamam . of hydrolysis and condensation were clear.

Effects of degree of dissociation of acid used on hydrolytic durability of ceramic primer

“…Figure 1 shows the 29 Si NMR spectra of γ-MPS in each mixture of γ-MPS and activator solutions: 0.05-mol/L acetic (spectrum B), phosphoric (spectrum C), and hydrochloric acid (spectrum D). 29 Si NMR peaks detected in the spectra were assigned based on peak assignments reported in previous studies [14][15][16] . These peak assignments are summarized in Fig.…”

Effect of different amounts of 3-methacryloxypropyltrimethoxysilane on the flexural properties and wear resistance of alumina reinforced PMMA

“…Due to the poor affi nity of surface chemistry between fi ller and resin matrix, modifi cation of fi ller surface is necessary to achieve good bonding between fi ller and resin matrix, which result in the improved strength of materials. One alternative surface modifi cation of fi ller is to use silane coupling agent to improve surface bonding with resin matrix [12][13] . Tri-methacryloxypropyl trimethoxysilane (MPS) is a dominant silane coupling agent used in dentistry to modify the surface of silica and glass fi ller blended with resin matrix [12][13][14] .…”

“…One alternative surface modifi cation of fi ller is to use silane coupling agent to improve surface bonding with resin matrix [12][13] . Tri-methacryloxypropyl trimethoxysilane (MPS) is a dominant silane coupling agent used in dentistry to modify the surface of silica and glass fi ller blended with resin matrix [12][13][14] . The silane coupling agent adsorbed on the fi llers creates bi-layer, chemisorbed and physisorbed silane layers 15) .…”

Effects of silane coupling agents and solutions of different polarity on PMMA bonding to alumina

“…Silane coupling agents were advocated in improving mechanical properties of the resin composite [7][8][9] . However, investigations on improving bond strength of alumina were mainly on commercial ceramic primer containing silane coupling agent 10) and tribochemical treatment 11) .…”

“…The concentration of silane coupling agent affected the thickness of siloxane layer on the substrate 18,19) . Additionally, moisture or water content is needed for initiating hydrolysis and condensation reaction of silane 7) . Water also affected the formation of monolayer and complete siloxane formation 20,21) .…”